it just doesn't make much sense to run an OS like Amiga anymore.
This is really not true.
I have a couple of 1+GHz ARM Cortex-A9 systems. Ubuntu is very slow on it, totally below usability. AROS is already working on Raspberry PI and is perfect choice for these systems.

The wonders of the Amiga was the OS + Hardware combo, the OS alone is just nostalgia.

Now almost everything has blitter and 3D engine.
And every hardware could be used creatively.
The problem is the stupid secrecy halo around mobile graphics chips. Well, this area is a huge patent-minefield, so at least they have reasons to be secretive.